# SUB. Marathon Pace & Training — Sub-3 to Sub-4. Garmin & COROS > Sub-3 to Sub-4. Garmin & COROS (iPhone/iPad app by Ching Kin Lau.) - Source: https://appshunter.io/ios/app/sub-marathon-pace-and-training/id6755816775 (this page in markdown: same URL + `.md`) - Developer: [Ching Kin Lau](https://appshunter.io/developer/1856543957) - Category: Sports, Health & Fitness - Price: Free - Age rating: 4+ - Requires: iOS 15.0 · 71 MB - Languages: American English - Released: 2025-12-02 - Data updated: 2026-09-04 - User reviews in markdown: https://appshunter.io/ios/app/sub-marathon-pace-and-training/id6755816775/reviews.md ## What is SUB. Marathon Pace & Training? [Stop training blind. Let the data define your peak.] SUB is the marathon training partner built for Garmin and COROS runners. Connect your watch once and every run syncs automatically. Pick a goal — Sub-3, Sub-3:30, Sub-4 — and SUB turns it into per-kilometre target pace, the right races, and coach workouts that tick themselves off the moment your watch syncs. Free. No subscription. No ads. Whether you're chasing your first 5K or a sub-3 marathon, SUB plans your next race with science, not guesswork. CORE FEATURES 1. Connect once, then it's automatic • Garmin — every Forerunner, Fenix, Epix and Venu; runs land within minutes • COROS — Pace 3, Apex 2 / 2 Pro, Vertix 2, with full running dynamics and lap detail • Apple Watch (via Apple Health) and Polar • Use Garmin and COROS together — mileage is de-duplicated, never double-counted 2. Goal-driven pacing • Pick Sub-3 / Sub-3:30 / Sub-4 and get target pace per km or mile, plus 5K, 10K, half and 30K splits • Pace calculator for any distance and finish time, with a track mode for lap splits 3. Running Fitness engine • Elite-grade model: Daniels–Gilbert. Enter a recent result and unlock your fitness level • Five scientific training paces — E, M, T, I, R — no more guessing at effort • Race predictions from 5K to the marathon to shape your SUB strategy 4. Coaches and clubs • Coaches assign long runs, intervals and tempo; they auto-complete when a matching run syncs — no manual logging • Coached classes and running clubs across Hong Kong 5. Race intelligence • Races in Hong Kong, Japan and worldwide: dates, venues, distances, entry windows • Save races with one tap; countdowns live on your Home Screen widget 6. Built for Hong Kong runners • Live sports ground availability — opening slots and bookings for every public track • Real-time running weather • Monthly challenges with live rankings Also: Apple Watch app, weekly / monthly mileage widgets, leaderboards, English / Traditional Chinese / Japanese. WHY SUB? Because running isn't magic — it's oxygen engineering. Garmin Connect and COROS Training Hub log your runs; SUB turns that data into a goal, a pace and a plan, so you can put your energy on the road. Download SUB free. Never miss a race — or a chance to get stronger. ## Version history (last 5 releases) ### 1.5.9 — 2026-08-28 What's New **Ranked Challenges: Every Kilometre Counts** No target. No cap. This month's challenge is a straight race for the most kilometres — and your live rank sits right on the card, so you always know exactly who's ahead and by how much. Time to chase them down. **Never Miss an Update** A newer SUB on the App Store? You'll see a gentle banner the moment it lands. One tap to dismiss, and it stays out of your way until the next release. **Running Fitness, Right Where You Left It** The 跑力分析 tab now remembers your place and the times you typed, so you can jump back in without starting over. **Coupons, Redeemed in One Tap** Show your code, staff tap confirm, done. And if a code times out, the screen now tells you and lets you try again. **Sharper Track Calendar** The sports ground calendar stops at the last published date instead of paging into empty months. **Rock Solid** Brief connection hiccups no longer show up as crashes. SUB now requires iOS 15 or later. ### 1.5.8 — 2026-08-22 What's New. **Fix the Double Count problem Comprehensive Mileage Widget: Track your weekly and monthly mileage directly on your Home Screen Elite Race Countdown: Stay focused on your goals with precise, second-by-second countdowns for all your synced races. Every moment counts toward your next PB. Live HK Track Info: Exclusive real-time integration of Hong Kong public sports ground schedules and booking status. Check availability instantly and never waste a trip to a fully booked track again. Liquid Glass Visuals: Experience our redesigned UI featuring the 2026 Liquid Glass design system, offering seamless transparency and depth that blends perfectly with your wallpaper. ### 1.5.6 — 2026-07-29 What's New. **Fix the Double Count problem Comprehensive Mileage Widget: Track your weekly and monthly mileage directly on your Home Screen Elite Race Countdown: Stay focused on your goals with precise, second-by-second countdowns for all your synced races. Every moment counts toward your next PB. Live HK Track Info: Exclusive real-time integration of Hong Kong public sports ground schedules and booking status. Check availability instantly and never waste a trip to a fully booked track again. Liquid Glass Visuals: Experience our redesigned UI featuring the 2026 Liquid Glass design system, offering seamless transparency and depth that blends perfectly with your wallpaper. ### 1.5.5 — 2026-07-11 What's New. **Fix the Double Count problem Comprehensive Mileage Widget: Track your weekly and monthly mileage directly on your Home Screen Elite Race Countdown: Stay focused on your goals with precise, second-by-second countdowns for all your synced races. Every moment counts toward your next PB. Live HK Track Info: Exclusive real-time integration of Hong Kong public sports ground schedules and booking status. Check availability instantly and never waste a trip to a fully booked track again. Liquid Glass Visuals: Experience our redesigned UI featuring the 2026 Liquid Glass design system, offering seamless transparency and depth that blends perfectly with your wallpaper. ### 1.5.4 — 2026-07-02 What's New. **Fix the Double Count problem Comprehensive Mileage Widget: Track your weekly and monthly mileage directly on your Home Screen Elite Race Countdown: Stay focused on your goals with precise, second-by-second countdowns for all your synced races. Every moment counts toward your next PB. Live HK Track Info: Exclusive real-time integration of Hong Kong public sports ground schedules and booking status. Check availability instantly and never waste a trip to a fully booked track again. Liquid Glass Visuals: Experience our redesigned UI featuring the 2026 Liquid Glass design system, offering seamless transparency and depth that blends perfectly with your wallpaper. ## Related topics [coros pace 4](https://appshunter.io/ios/topics/coros-pace-4) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-04.*